4 Answers
4

we are using negotiate kerberos authentication in sharepoint, changing the service account password some how removed the SPN's, again reconfigured the SPN for that service account and reconfigured the service accounts for web-application pool and IIS reset worked

Look for the App service account, and then click the Edit icon next to the title.

In the Credential Management section, check Change password now.

Next, also in this section, select Use existing password and then enter the password.

Scroll down, and then click OK. The page will be busy for less than a minute. Once it returns, move on to the next step.

Remote into a WFE.

Launch an elevated command shell.

Execute IISRESET, and then wait for it to complete.

Repeat steps 12-14 for each WFE in the farm.

Try connecting to each of the content web applications of the farm. You may get the usual "Sorry...". This is expected and is due to time out behavior: the IISRESET initiates a complete recompile of each of the web applications on the WFEs. Keep trying.

Once you verify the content web applications are back up, try hitting your My Site and your OneDrive. Here too you may experience errors presented in the browser. This is expected. The My Site web application was also recompiled (if they are co-hosted with your content web applications).

Summary

The SharePoint App service account (spApp) is typically used with content web applications and the Work Management Service Application (this is created and configured automatically for you during normal install). Managing this web application AppPool identity via SharePoint Managed Accounts makes changing this particular password a snap. An IISRESET is absolutely necessary after restarting SharePoint servers and then changing the password in Managed Accounts. if you don't do this, you'll experience 503 Service Unavailable errors.

i already did this procedure, Credentials prompts after changing service account password for all user and some able to logon through chrome not all. all users are unable to logon through IE
– karthikJul 13 '18 at 16:26